Please Help

[yfs200p]

I have a strange problem with my truck. If I drive it for a little while, and i shut it off for a few minutes, it has a hard time firing back up again. for example, i drove to the gas station (10 min away) and i filled it up and when i got back in to start it, it just sat there cranking and cranking with the occasional fire. it cranks to the point where its starting to wear down the battery, and then finally it will fire up. it almost seems as if its not getting fuel. it has happened a couple of times, but doesnt happen every time. it also diesels a little bit every once in a while so im thinking maybe it has something to do with the air/fuel mixture, but i dont know. its a bone stock 305, not one modification to the motor. thanks for your help